Spawn Boxes

Spawn Boxes

A technical block that gives a structure dedicated spawning areas.

Vanilla's spawn_overrides apply to the whole structure bounding box, and there's only one pool per structure. A spawn box spawns mobs only inside the box, and a structure can have several boxes with different names and different pools. Useful when you want enemies in the hold of a ship but not on the deck.

Getting Started

Place the Spawn Box Block in a jigsaw structure piece (or in your own structure that implements ISpawnBoxStructure), then give it a name and a size in its screen. The block itself disappears at worldgen time like a jigsaw block does.

Then add a spawn_boxes entry to the structure json. The name has to match the one you set on the block:

{
  "spawn_boxes": [
    {
      "category": "monster",
      "name": "galleon_enemies",
      "spawns": [
        {
          "type": "minecraft:pillager",
          "weight": 4,
          "minCount": 1,
          "maxCount": 4
        },
        {
          "type": "supplementaries:plunderer",
          "weight": 7,
          "minCount": 1,
          "maxCount": 3
        }
      ]
    }
  ]
}

JSON Format

spawn_boxes is a list. Each entry:

Field	Type	Default	Description
category	mob category	required	monster, creature, ambient, water_creature, ...
name	string	required	Must match the name set on the block. Several boxes can share a name to form one area
spawns	weighted list	required	Same format as vanilla spawn_overrides and biome spawners

Each spawns entry is a vanilla SpawnerData: type, weight, minCount, maxCount.

You can have as many entries as you want, with different names and categories, and they stay independent of each other.